Fading and drifting
FM range is limited to about 25 miles (40 km), except for some high power stations.
If a vehicle is moving away from the desired station's transmitter, the signal will tend to fade and/ or drift. This condition is more prevalent with FM than AM, and is often accompanied by distortion.
Fading and drifting can be minimized to a certain degree by careful attention to fine tuning or selection of a stronger signal.
Static and fluttering
When the line-of-sight link between a transmitter and vehicle is blocked by large buildings or mountains, the radio sound may be accompanied with static or fluttering because of the characteristic of FM.
In a similar effect, a fluttering noise is sometimes heard when driving along a tree-lined road.
This static and fluttering can be reduced by adjusting the tone control for greater bass response until the disturbance has passed.
Because of the reflecting characteristics of FM, direct and reflected signals may reach the antenna at the same time (multipath) and cancel each other out.
As a vehicle moves through these electronic dead spots, the listener may hear a momentary flutter or loss of reception.
When two FM stations are close to each other, and an electronic dead spot, such as static or multipath area, interrupts the original signal, sometimes the stronger second signal will be selected automatically until the original one returns.
This swapping can also occur as you drive away from the selected station and approach another station of a stronger signal.
Compact disk player
To avoid damage to compact disc player and discs.
Use only compact discs labeled as shown, having no dirt, damage or warpage.
Never attempt to disassemble or oil any part of the player unit.
Do not insert any object other than a disc into the slot.
Remember there are no user-serviceable parts inside the compact disc player.
Do not allow the disc to sustain any fingerprints, scrapes or stickers on the surfaces.
This may cause poor sound quality.
Hold the disc only on the edge or center hole.
When not in use, take the disc out of the player, put the disc back into its case and store it away from dust, heat, damp and direct sunlight.
Leaving the disc on the dashboard in the sun can damage the disc.
If the disc gets dirty, clean the disc by wiping the surfaces from the center to the outside in a radial direction with a soft cloth.
Do not use a conventional record cleaner or anti-static record preservative.
Disc cleaners are available in audio stores.